deepseek-harness/packages/lsp

lsp/ - LSP capability family

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The language-server capability seam: an LSP Service Definition, a generic stdio provider, and the model-facing lsp tool. All product packages.

Package	Role	ctx key
lsp/	Service Definition (provider registry by branded id + extension mapping, per-query selection, vocabulary, LspError)	ctx.lsp
lsp-local/	Generic multi-server stdio backend over ctx.fs and ctx.subprocess (JSON-RPC, transient-open queries)	(registers providers on ctx.lsp)
tool-lsp/	Model-facing lsp tool (four operations, one-based UTF-16 cursor coordinates)	(registers on ctx.tools)

The Service Definition lives at lsp/lsp/. The seam exposes exactly four semantic operations — goToDefinition, findReferences, goToImplementation, hover — and no generic JSON-RPC escape hatch, so a provider swap does not change how the model asks for navigation and no protocol payload or unreviewed mutation reaches the model contract. Providers register capabilities, not tools; tool-lsp is the only owner of the model-facing name, schema, prompt guidance, and presentation.

See the LSP capability seam Agent Note for the design rationale, including why documents open transiently per query, why the stdio host consumes the shared filesystem/subprocess execution world, and why extension ownership is exclusive within one runtime.

The subsystem reference — operations, coordinates, requests/results, LspError — is docs/subsystems/lsp.md; design rationale in the LSP capability seam Agent Note.